(a)
Interpretation:
The formula of product obtained by reducing 2-butanone to 2-butanol has to be written and its chirality has to be predicted.
Concept introduction:
Chirality: The presence of four different atoms (or groups) at carbon is known as asymmetric carbon and is known as chiral center of the compound.
Lithium aluminum hydride: Used as strong reducing agent, hydride (weaker Al-H bond) act as strong nucleophile that attack the electrophilic carbon of carbonyl group forming metal alkoxide intermediate complex; acid workup is the final step involving protonation of alkoxide oxygen results the alcohol as aproduct.
(b)
Interpretation:
The product does not exhibit optical activity; the reason has to be explained.
Concept introduction:
Chirality: The presence of four different atoms (or groups) at carbon is known as asymmetric carbon and is known as chiral center of the compound.
Optical activity: The ability of a chiral molecule to rotate the plane of plane-polarized light, using polarimeter.
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